Brake-drum, pulley, or the like



M. BIRKIGT.

BRAKE DRUM, PULLEY, 0R THE LIKE. APPLICATION FILED MAR. 28, I9I9.

1,394,402. PIIIenIed OCI. 18, 1921.

MARC BIRKIGT, 0F BOIS-COLOMBES, FRANCE.

BRAKE-DRUM, IP 'ULLEY, OR THE LIKE.

Specification of Letters Patent.

Patented 0ct. 18, 1921.

applicati@ mea March 2s, 1919. serial No. 285,889.

To all lwhom t may concern.'

Be it known that I, MARC BIRKIGT, a citizen of the Republic of Switzerland, residing in Bois-Colombes, Seine, France, have invented certain new and useful Improvements in Brake-Drums, Pulleys, or the like, of which the following is a specification.

This invention relates to brake drums, pul` leys or the like. The invention has for an object to make brake drums or the like so that they are lighter and more durable, while it is possible to cool them in a more elicacious manner than hitherto.

The brake drum or the like according to the present invention comprises a body of a light .metal having secured thereto on the surfaces whereon slipping or friction occurs,

a thin rim or lining of steel or other hard metal, the friction being exerted either on the outer or on the inner surface, or even on both surfaces. The simultaneous use ofa heavy, hard metal in the form of a thin (drawn or rolled) hard lining for the surfaces where the friction occurs and of a light metal or alloy sults in the production of a resistant and .l exceedingly light object.

The inventlon further comprises certain other arrangements more explicitly referred to hereinafter and claimed in the claims.

The invention will be clearly understood from the following description and the accompanying drawings, ample.

Figures 1 4and 2, show respectively in seci. tion on the line 1-1, Fig. 2, and on the line 2 2, Fig. 1, a brake drum according to the invention. c,

The brake drum a is made of an aluminum alloy, for instance in the form of a cup which is bored at aoto receive the spindle on which the drum is to be mounted, and the drum and the yspindle 'rare secured together by any suitable means, for instance, by means of an intermediate part connected to the drum by bolts or rivets vpassing through -holes ao The rim is arranged concentrically with the axis of the drum and made ,of a metal resisting wear, such as a hard spring steel band b. The steel band or ring b can be arranged inthe mold Vin which the casting of the drum is to takeplace in the position which it is to occupy, so as to obtain after casting and removal from the mold, a drum for the body itself re-V given by way of ex-` 'body in which the said band is set and to which 1t adheres, making intimate contact therewith permitting a free heat interchange.

Through such or other means of fixation of the lining a drum is obtained which is ready to receive a brake which acts on the drum through the band whether the said band be placed outside or inside the drum. The drum is made in the form of a cup-in the latter case.

A part a is made of light and readily fusible metal and the inner or outer walls of it are provided with ribs a arranged parallel to the direction of movement firstly for the purpose of reinforcingand strengthening the drum as well as lightening it and secondly for the purpose of easily cooling the drum during the braking operation.

A brake drum constituted as described, is exceedingly light,its wear is less than that of Athe brake drums generally used, 'as the process of rolling, drawing or vthe like per mits, when'the proper kind of steel or other metal is used, very resistant surfaces to beV obtained thereby allowing the use of thin linings.

Obviously the invention is not` limited to the construction described but comprises any modifications within the scope of the claims, including of course that the rim b may driven with force on to or into the drum.

The drum maybe used-as a transmission or guide pulley or any like purpose. Y

What I claim4 as my invention and desire to secure by Letters Patent is 1. A brake drum having abody made of a light metal and a comparatively thin lining of a hard metal, the latter being of greater specific weight than the former, said lining being fixed on the surfacesf'lof said which are subject to frictional; contact.

2. 'A brake drum having a body of an aluminum alloy andya lining made of a thin band of steel secured on the surface of\said body 3. A brake drum having an active surface. formed of a metal adapted stronglyto resist wear and a body ily fusible metal.

, 4:. A brake drum aluminum alloy, and a4 thin lining `of drawn spring steel on a surface of said body whereon frictional effects are experienced. j

5. A brake drum having a-body of aluminum and a thin lining of a hard metal capa- 110 which is subject to frictional resistance.

formed of a light, read- 4 having a body of an rienced.

6. A brake drum comprising av friction -shoe of hard material provided with rein forcing means in intimate contact therewith made of metal having a high heat conduc tivity.

7. A brake drum comprising a friction shoe of hard material, and reinforcing means in intimate contact therewith provided with heat dissipating elements.

8. A brake drum comprising a friction shoe of hard material', and reinforcing means in intimate contact therewith pro vided with heat dissipating flanges.

9. A brake drum formed of a thin band of hard material and a heat dissipating reinforcing therewith..A

l0. A brake drum comprising a friction shoe of homogenized material and a reinforcing element of high heat conductivity cast in-unitary Contact therewith.

11. A brake drum comprising a rolled wheel friction shoe and an aluminum alloy reinforcing element cast unitarily therewith.

ln testimony whereof have hereunto set my hand in presence of ltwo subscribing witelement cast in unitary contact nesses.

.y MARC BlRKIGT. Witnesses: y

JOHN F. SIMoNs, PAUL BLUM. 

